Notion (Wikipedia) — source summary
The Wikipedia article on notion, chased as a neutral source for the Notion PKM-tools
gap (and a rare third-party, non-vendor source). Capture in raw/notion-wikipedia.md.
Key facts
- Cloud-based all-in-one workspace: notes, docs, wikis, databases, kanban, tasks.
- Notion Labs (founded 2013, SF; Ivan Zhao et al.); 1.0 launched Aug 2016.
- 20M users by Oct 2021 ($10B valuation); $500M+ ARR by Sep 2025 — by far the most commercially successful tool in this wiki’s PKM survey.
- Proprietary, freemium, cloud-hosted — data on Notion’s servers, not local plain files. Structured-database model + real-time collaboration.
- AI chatbot (Feb 2023); a Developer Platform with 1M+ “Custom Agents” (since Feb 2026).
Why it’s here
Notion is the counterpoint to cluster A’s convergence story (see notion and synthesis): the mass market’s favorite PKM tool went the opposite way from logseq/obsidian/tiddlywiki5 — cloud/proprietary and structured-DB rather than local plain-markdown-you-own. A useful, honest bound on the “plain files” thesis.